The main weapon used by British soldiers in the trenches was the bolt-action rifle. 15 rounds could be fired in a minute and a person 1, 400 metres away could be killed.
Machine guns needed 4-6 men to work them and had to be on a flat surface. They had the fire-power of 100 guns.
The German army were the first to use chlorine gas at the battle of Ypres in 1915. Chlorine gas causes a burning sensation in the throat and chest pains. Death is painful - you suffocate! The problem with chlorine gas is that the weather must be right. If the wind is in the wrong direction it could end up killing your own troops rather than the enemy.
Mustard gas was the most deadly weapon used. It was fired into the trenches in shells. It is colourless and takes 12 hours to take effect. Effects include: blistering skin, vomiting, sore eyes, internal and external bleeding. Death can take up to 5 weeks.
xThe Zeppelin, also known as blimp, was an airship that was used during the early part of the war in bombing raids by the Germans. They carried machine guns and bombs. However, they were abandoned because they were easy to shoot out of the sky.
The more modern tank was not developed until just before the end of the war. It could carry 10 men, had a revolving turret and could reach 4mph.
Planes were also used for the first time. At first they were used to deliver bombs and for spying work but became fighter aircraft armed with machine guns, bombs and some times cannons. Fights between two planes in the sky became known as 'dogfights'
Torpedoes were used by submarines. The Germans used torpedoes to blow up ships carrying supplies from America to Britain.